What’s DNA got to do with it?

If you work in a hospital and discover a mix-up that sent two babies home with the wrong parents, the right thing to do is correct the mix-up ASAP, right? But what if the mix-up isn’t discovered for a while? What if the mix-up is discovered, say, 4 years later? My advice is: shut the hell up about it. Placing children with their biological parents isn’t nearly as important as keeping them in the homes where they’ve been raised their entire lives, by loving parents. Especially if they’re being taught (I presume) different languages because the families are from different countries. This is going to do no good whatsoever, and will cause heartache and trauma for everybody involved. I can’t even imagine.